Sustainable Cellulose-Based Gels: Synthesis, Chemical Modification, and Biomedical Application

Area of Science:

• Materials Science
• Biomedical Engineering
• Polymer Chemistry

Background:

• Growing demand for sustainable, biocompatible, and non-toxic biomaterials.
• Cellulose, the most abundant renewable biopolymer, is an ideal platform due to its hydrophilicity, tunability, and biodegradability.
• Advancements in biobased gels are crucial for biomedical applications.

Purpose of the Study:

• To review recent advancements in processing and engineering cellulose-based hydrogels for drug delivery.
• To explore synthesis routes and chemical modifications for tuning hydrogel properties.
• To highlight characterization techniques and future perspectives.

Main Methods:

• Systematic exploration of physical, chemical, and hybrid cross-linking strategies.
• Emphasis on chemical modifications (sulfation, carboxylation, etherification, polymer grafting) for property tuning.
• Highlighting characterization techniques (structural, morphological, rheological) to link cross-link density with performance.

Main Results:

• Modified cellulose hydrogels exhibit tunable mechanical strength, swelling kinetics, and stimuli-responsiveness (pH, temperature, enzyme).
• Characterization confirms the relationship between cross-link density, water-holding capacity, and network homogeneity.
• Cellulose hydrogels demonstrate efficient drug loading, controlled release, and potential for targeted therapy.

Conclusions:

• Cellulose-based hydrogels are highly effective for drug delivery due to their tunable properties and porous 3D architecture.
• Challenges include industrial scalability and mechanical stability, but future integration with nanoparticles and bioactive moieties shows promise.
• These advanced cellulosic materials hold immense potential for improving clinical outcomes and supporting circular economy goals.